Query installed passports

[HEG]

The VISA header defines constants for each interface type. But if a use has a passport driver installed, the intfType value from viParseRsrc might return a different, unknown value. Is there a way to query these values and the interface type prefix or the library to which they belong? In other words, is there a function that can be used to obtain a table like:

"gpib" -> 1

"vxi" -> 2

...

"some new thing" -> 101

[Luis_CT]

Hello HEG.

Thanks for using the NI forums. Could you please describe your issue in a better way? What VI are you using? What are the parameteres that youre sending? Please be more specific.

Regards.

-- Luis C

[HEG]

Hi Luis,

Thanks for answering. I am not using any VI, just calling the VISA library from C. As I mentioned, when you call the viParseRsrc function, the intfType value tells you about the interface type of the resource. The posible values are defined in "visa.h":

#define VI_INTF_GPIB                (1)
#define VI_INTF_VXI                 (2)
#define VI_INTF_GPIB_VXI            (3)
#define VI_INTF_ASRL                (4)
#define VI_INTF_PXI                 (5)
#define VI_INTF_TCPIP               (6)
#define VI_INTF_USB                 (7)

But if you have another inteface type supported within VISA using an external library through and visible in NI-MAX the the intfType value is not in this list.

The question is: how you can know which are the valid values in a particular instalation and how can you relate them to the resource name?

Thanks,

Hernan

[Dennis_Knutson]

Those are the supported types. What other sort of physical interface are you planning on?

[HEG]

Those are the supported types by default. If you install another passport, new types are supported. For those of you unfamiliar:

"A passport is a plug-in library module that handles the communications with a class of instruments. NI-VISA includes passports for GPIB, serial, TCPIP, FireWire, USB, etc. The passports visible to your installation of NI-VISA can be found in the VISA Options section of National Instrument’s Measurement and Automation Explorer application.""

For example after you have installed the Lecroy VICP paper: "VICP::<ip address>::INSTR" becomes a valid resource name and gets assigned a different interface type value. See for example: http://teledynelecroy.com/doc/understanding-vicp-and-the-vicp-passport

My question is how to query these new interface type values.

[Dennis_Knutson]

Okay. I've never used the LeCroy and assumed it would be a tcp/ip resource. What value do you get from this?

[Leonard33]

Hello All,

The TeledyneLeCroy Passport uses TCP/IP and the VISA resource will be in form of:  VICP::<IP Address of scope>

Here is a link to an application brief that has more information:  Understanding VICP and the VICP Passport

If you set the scope up as an LXI(VXI11) interface, you can just use the traditional resource:  TCIPx::<IP Address>::inst0::INSTR

I hope this helps!

Regards,

Leonard Brown

Applications Engineer

TeledyneLeCroy

[HEG]

Hi Leonard,

Thanks for your response. My question was not really pointed to the Lecroy but was more general. How do you query installed passports and the interface type values from a  NI-VISA installation.

best,

Hernan

[Leonard33]

Hello Hernan,

OK, sorry.  I do not see a way to do this when using a passport either.

Regards,

Leonard Brown

Applications Engineer

TeledyneLeCroy